You have a 50/50 chance of winning or losing if you play the flip coin game against the computer. On a quantum computer, however, there is a strong likelihood that you will lose the game.
Interested in learning the reason?
Watch this Video to Know More about the Explaining The Principles Of Quantum Computing
Speaking about its drawbacks, the major one will be that corporations won’t be ready to switch from cryptography to post-quantum algorithms. This is due to the fact that present encryption techniques are easy to hack.